Research Article
The Solid Phase Distribution and Bioaccessibility of Arsenic, Chromium, and Nickel in Natural Ironstone Soils in the UK
Table 1
Summary of geological and sampling information and chemical measurement data.
| | Sample | Geology | Sampling location | Type | Organic matter (%) | Soil pH | Total As (mg kg−1) | Bioaccessible As (mg kg−1) | As BAF (%) | Total Cr (mg kg−1) | Bioaccessible Cr (mg kg−1) | Cr BAF (%) | Total Ni (mg kg−1) | Bioaccessible Ni (mg kg−1) | Ni BAF (%) |
| | GBA number 1 | L | GB | A | 12.7 | 6.86 | 153 | 12.8 | 8.3 | 275 | 2.0 | 0.74 | 108 | 3.3 | 3.1 | | GBA number 2 | L | GB | A | 14.6 | 7.18 | 112 | 5.4 | 4.8 | 302 | 1.1 | 0.4 | 114 | 2.6 | 2.3 | | GBA number 3 | L | GB | A | 13.4 | 6.70 | 82 | 4.9 | 6.0 | 203 | 1.4 | 0.7 | 88 | 2.9 | 3.3 | | GBR number 1 | L | GB | R | 10.4 | 6.29 | 84 | 4.2 | 5.1 | 264 | 1.4 | 0.5 | 97 | 4.0 | 4.1 | | GBR number 2 | L | GB | R | 10.8 | 6.41 | 92 | 3.8 | 4.1 | 274 | 1.4 | 0.5 | 98 | 4.4 | 4.5 | | SA number 11 | L | S | R | 13.0 | 6.85 | 337 | 8.1 | 2.4 | 379 | 1.1 | 0.3 | 185 | 3.9 | 2.1 | | SA number 2 | L | S | A | 12.4 | 6.25 | 348 | 7.7 | 2.2 | 402 | 0.9 | 0.2 | 190 | 4.4 | 2.3 | | SA number 3 | L | S | A | 11.0 | 7.01 | 305 | 5.6 | 1.8 | 382 | 0.9 | 0.2 | 176 | 3.2 | 1.8 | | SR number 1 | L | S | R | 13.8 | 5.83 | 392 | 6.0 | 1.5 | 406 | 0.9 | 0.2 | 207 | 4.4 | 2.1 | | SR number 21 | L | W | R | 12.9 | 5.97 | 417 | 5.0 | 1.2 | 447 | 0.8 | 0.2 | 218 | 4.2 | 1.9 | | WA number 1 | L | W | A | 12.4 | 7.12 | 289 | 7.4 | 2.6 | 321 | 1.1 | 0.3 | 159 | 3.6 | 2.3 | | WA number 2 | L | W | A | 14.3 | 7.11 | 230 | 7.7 | 3.3 | 273 | 1.1 | 0.4 | 136 | 2.9 | 2.1 | | WA number 3 | L | W | A | 12.0 | 7.09 | 249 | 6.2 | 2.5 | 293 | 1.1 | 0.4 | 147 | 3.0 | 2.1 | | WR number 1 | L | W | R | 15.8 | 6.98 | 250 | 5.9 | 2.4 | 342 | 1.0 | 0.3 | 153 | 3.6 | 2.4 | | WR number 2 | L | W | R | 13.9 | 7.11 | 280 | 6.3 | 2.3 | 359 | 1.1 | 0.3 | 158 | 3.6 | 2.3 | | LHA number 1 | IO | LH | A | 7.71 | 7.25 | 17 | 1.9 | 11.0. | 65 | 0.5 | 0.8 | 25 | 1.4 | 5.7 | | LHA number 2 | IO | LH | A | 8.52 | 7.06 | 14 | 1.6 | 11.4 | 69 | 0.6 | 0.9 | 28 | 1.6 | 5.8 | | LHA number 3 | IO | LH | A | 9.21 | 7.27 | 18 | 2.1 | 11.6 | 68 | 0.6 | 0.9 | 31 | 1.6 | 5.3 | | LHR number 1 | IO | LH | R | 11.3 | 7.43 | 38 | 4.0 | 10.5 | 96 | 0.7 | 0.7 | 60 | 1.3 | 2.1 | | LHR number 2 | IO | LH | R | 9.05 | 7.54 | 29 | 2.9 | 10.1 | 83 | 0.6 | 0.7 | 46 | 1.2 | 2.6 | | SAA number 1 | IO | SA | R | 5.15 | 7.11 | 31 | 3.6 | 11.7 | 51 | 0.7 | 1.3 | 17 | 1.2 | 6.9 | | SAA number 2 | IO | SA | A | 6.29 | 6.72 | 50 | 3.6 | 7.1 | 53 | 1.1 | 2.1 | 21 | 1.5 | 7.0 | | SAA number 3 | IO | SA | A | 8.23 | 6.79 | 23 | 2.9 | 12.4 | 57 | 1.3 | 2.2 | 21 | 1.4 | 6.7 | | SAR number 1 | IO | SA | R | 6.63 | 6.92 | 15 | 2.2 | 14.7 | 52 | 0.8 | 1.6 | 18 | 1.6 | 8.7 | | SAR number 2 | IO | SA | R | 4.90 | 7.16 | 18 | 2.5 | 14.1 | 54 | 0.7 | 1.3 | 19 | 1.6 | 8.2 | | DA number 1 | L | D | A | 16.1 | 7.24 | 217 | 7.4 | 3.4 | 340 | 1.4 | 0.4 | 154 | 4.3 | 2.8 | | DA number 21 | L | D | A | 13.9 | 7.28 | 201 | 6.4 | 3.2 | 364 | 1.4 | 0.4 | 148 | 4.4 | 3.0 | | DA number 3 | L | D | A | 16.0 | 7.18 | 178 | 7.0 | 3.9 | 321 | 1.5 | 0.5 | 142 | 4.5 | 3.2 | | UHR number 11 | IO | UH | R | 12.0 | 6.75 | 20 | 3.1 | 15.3 | 98 | 1.1 | 1.1 | 60 | 3.2 | 5.3 | | UHR number 2 | IO | UH | R | 9.42 | 6.88 | 16 | 2.4 | 14.8 | 80 | 0.9 | 1.1 | 44 | 2.4 | 5.4 |
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L: Lias; IO: Inferior Oolite Groups; GB: Great Bourton; S: Shenington; W: Wroxton; LH: Lower Heyford; SA: Steeple Aston; D: Drayton; UH: Upper Heyford; A: allotment; R: residential sampling site. Total and Bioaccessible PHE concentrations as mg kg−1; BAF denotes bioaccessible fraction (%). pH uncertainty is ±0.05 units and organic matter is ±1%. 1indicates samples used for sequential extraction.
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